Recs.
Updated
SpecsUpdate
Pros

Pro Great selection of high quality and polished apps
Apps must pass tighter guidelines to make it into the app store.
Pro Easy to learn to use
The iOS user interface is known by millions. It has mostly stayed the same throughout the years.
The main view is a simple grid menu which displays all the installed applications. On the bottom there is an app tray which displays the icons for the most used apps.
The iOS user interface is especially easy for users who want an easy experience and don't want to spend time learning on how to navigate through their phones. Everything is displayed right in the main view and it's easy to find. The fact that it has not changed, at least significantly in the past years has made it possible for it's most devoted users to keep upgrading their iOS devices without having any difficulty to adapt.
Pro Consistent performance
Unlike Android, iOS is developed to be used on similiar devices and both the hardware and iOS itself are developed by Apple. This means that they are highly adapted to work with each other. Even after the hardware becomes a little outdated, the performance still remains consistent and smooth on several iOS versions.
Pro Longtime support for older smartphones / tablets
iPhones don't become obsolete in a year or so. Most of them get updates for even more than about 4 years.
Cons
Con Tied to Apple
No alternative software can be installed unless you keep your phone jailbroken (with the system outdated and probably with security issues).
Con Older iPhone models with poorer batteries might perform slower
iOS delibrately slows the CPU down on older iPhones with worn-out batteries so as to preserve battery life, resulting in possible slower-than-expected performance. This only applies to iPhone 6, iPhone 6S, and iPhone SE running iOS 10.2.1 and above, and iPhone 7 running iOS 11.2 and above.

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